On Fri, Sep 04, 2020 at 12:37:06PM +0200, Gerd Hoffmann wrote: > On Fri, Sep 04, 2020 at 12:05:08PM +0200, Christian Ehrhardt wrote: > > Hi, > > I've had continuous issues with this and wanted to reach out > > if that is a common issue everyone has or just me lacking a little > > detail on my setup. > > > - QXL with multiple heads > > - works fine (so multi display in general seems fine for the > > involved components) > > Yep. > > > - VGA + QXL, QXL + Virtio, Virtio + QXL: > > - Guest only detects primary display > > - Can't convince X in the guest to use the second device as well > > - lspci lists both devices just fine > > - dmesg shows the kernel is initializing them, e.g. drm for virtio > > As far I know xorg can't really deal with multiple display devices. > So typically you have a single device with multiple connectors, so > you can hook up multiple monitors. IIRC, it Xorg can support multiple devices, but it is not zero-conf, it needs a custom config file to be written, and has some functional limitations compared to a multi-head layout. It has been at least 10+ years since I did something like this though :-) > In the virtual world qxl and virtio support multiple heads, so pick > one of these two and enable as many heads as you need. Also make sure > spice-agent is active in the guest, otherwise operating the mouse is a > PITA. This is definitely the better approach to get zero-conf though. > Dunno how things are with wayland. > > > - 2*QXL > > - X has issues to initialize on user login > > - no error in the log, just hung > > The windows guest driver doesn't support qxl devices with multiple > outputs and expects one qxl device per head instead. So use this > one for windows guests. > > HTH, > Gerd > Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
